<a href="#my">我是跳转到div</a>
<div id="my"></div>
<script>

$(function(){

    //锚点跳转滑动效果

    $('a[href*=#],area[href*=#]').click(function() {

        console.log(this.pathname)

        if (location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') && location.hostname == this.hostname) {

            var $target = $(this.hash);

            $target = $target.length && $target || $('[name=' + this.hash.slice(1) + ']');

            if ($target.length) {

                var targetOffset = $target.offset().top-50;

                $('html,body').animate({

                            scrollTop: targetOffset

                        },

                        1000);

                return false;

            }

        }

    });

})

</script>